EP1403223B1 - Dispositif de concentration de boues - Google Patents

Dispositif de concentration de boues Download PDF

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Publication number
EP1403223B1
EP1403223B1 EP02769595A EP02769595A EP1403223B1 EP 1403223 B1 EP1403223 B1 EP 1403223B1 EP 02769595 A EP02769595 A EP 02769595A EP 02769595 A EP02769595 A EP 02769595A EP 1403223 B1 EP1403223 B1 EP 1403223B1
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EP
European Patent Office
Prior art keywords
sludge
tank
filter cloth
filtrate
coagulant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02769595A
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German (de)
English (en)
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EP1403223A4 (fr
EP1403223A1 (fr
Inventor
Kiyoshi Bur. Sewerage Tokyo Metrop. Gov. SUZUKI
Kinichiro Bur. Sewerage Tokyo Metrop. Gov KOUNO
Takashi Etou
Itaru c/o NKK Corporation SAKAI
Satoru c/o NKK Corporation UDAGAWA
Arimitsu c/o NKK Corporation ISHII
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JFE Engineering Corp
Japan Institute of Wastewater Engineering Technology
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JFE Engineering Corp
Japan Institute of Wastewater Engineering Technology
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Priority claimed from JP2002020650A external-priority patent/JP2003033800A/ja
Application filed by JFE Engineering Corp, Japan Institute of Wastewater Engineering Technology filed Critical JFE Engineering Corp
Publication of EP1403223A1 publication Critical patent/EP1403223A1/fr
Publication of EP1403223A4 publication Critical patent/EP1403223A4/fr
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Publication of EP1403223B1 publication Critical patent/EP1403223B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/056—Construction of filtering bands or supporting belts, e.g. devices for centering, mounting or sealing the filtering bands or the supporting belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
    • B01D33/463—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
    • B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/28—Position of the filtering element
    • B01D2201/287—Filtering elements with a vertical or inclined rotation or symmetry axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/48—Overflow systems
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance

Definitions

  • the present invention relates to an apparatus for concentrating sludge. More particularly, the invention relates to an apparatus according to the preamble portion of claim 1 for concentrating sludge which permits subjecting sludge occurring, for example, in a sewage disposal plant to solid/liquid separation and a concentrating treatment in a large quantity and at a high efficiency, without depending upon properties of sludge.
  • Fig. 16 is a flowchart illustrating the sludge concentrating method in the sewage disposal plant.
  • sewage flowing into a primary settling tank 1 is subjected to a solid/liquid separation through a gravity precipitating treatment.
  • supernatant water after the precipitation treatment is fed to a reaction tank 2, where it is subjected to an activated sludge concentration.
  • the sewage thus treated in the activated sludge concentration is fed to a secondary settling tank 3, where it is subjected again to a solid/liquid separation through a gravity precipitating treatment.
  • the resultant supernatant water obtained in the secondary settling tank 3 is fed to a sterilizing tank 4, where it is sterilized.
  • the treated water resulting from sterilization of sewage is discharged to rivers, lakes or sea water.
  • sedimentation sludge resulting from the primary settling tank 1 and excess sludge resulting from the secondary settling tank 3 are usually mixed.
  • the resultant mixed sludge is fed to a sludge concentrator 5.
  • the mixed sludge fed to the sludge concentrator 5 has usually a solid concentration of about 1 % or so.
  • the mixed sludge is subjected to a concentration treatment in the sludge concentrator 5 through gravity precipitation. This results in a concentrated sludge having a solid concentration of about 2 to 3 %.
  • the resultant concentrated sludge is stored in a sludge storage tank 6.
  • the sludge stored in the sludge storage tank 6 is dehydrated by a dehydrator 7. Dehydrated cakes are thus obtained.
  • gravity precipitation is used for concentration treatment of mixed liquid of sewage flowing down and sludge (hereinafter referred to as "sludge"). More specifically, the sewage flowing down is subjected to solid/liquid separation by gravity precipitation in the primary settling tank 1. The sewage concentrated through activated sludge is subjected to the solid/liquid separation by gravity precipitation in the secondary settling tank 3. The mixed sludge is concentrated by gravity precipitation in the sludge concentrator 5.
  • the above-mentioned sludge concentrating method based on gravity precipitation requires only small power consumption, thus providing an advantage of a low treatment cost.
  • the apparatus for sludge concentration based on gravity precipitation has a large area of installation, and has a problem in that the treatment ability of the apparatus largely depends upon properties of sludge and the water temperature to be treated.
  • the reaction tank In high-level treatment methods such as removal of nitrogen or phosphorus of which the positive adoption is currently considered with a view to preventing eutrophication of public waters, the reaction tank is operated with a higher solid concentration than in the standard activated sludge process in many cases in order to increase a reaction rate. It becomes therefore necessary to apply a solid/liquid separation treatment to sludge-mixed liquid having high concentration flowing from the reaction tank.
  • adoption of a high-level treatment requires replacement of the secondary settling tank 3 in Fig. 16, or development of new sludge concentrating means capable of complementing the same.
  • the present inventors developed a sludge concentrating apparatus disclosed in Japanese Unexamined Patent Application Publications Nos. 11-216312, 2000-5506 and 2000-262817 on which the preamble portion of claim 1 is based.
  • the present inventors further studied the above-mentioned conventional sludge concentrating apparatus, and obtained the following findings.
  • the present invention has an object to provide a sludge concentrating apparatus which permits, when disposing of sludge by using the above-mentioned conventional sludge concentrating apparatus, efficient concentrating treatment in a large quantity without depending upon properties of sludge.
  • a sludge concentrating apparatus as defined in claim 1.
  • Preferred embodiments are defined in the dependent claim 5.
  • Fig. 1 is a perspective view, as viewed from the filter cloth descending side, illustrating a sludge concentrating apparatus of the present invention
  • Fig. 2 is a perspective view, as viewed from the filter cloth ascending side, illustrating the sludge concentrating apparatus of the present invention
  • Fig. 3 is a sectional view illustrating the sludge concentrating apparatus of the present invention
  • Fig. 4 is a perspective view, as viewed from the filter cloth descending side, illustrating another sludge concentrating apparatus of the present invention, wherein a filtrate chamber is provided in the sludge tank
  • Fig. 5 illustrates the method for adding an acid and a coagulant to sludge.
  • reference numeral 8 represents a sludge tank having a sludge feed pipe 9 and a concentrated sludge discharge pipe 10. Sludge is fed from the sludge feed pipe 9 via an inlet weir described later into the sludge tank 8.
  • Reference numeral 11 represents a filtrate chamber provided in the sludge tank 8. Outside the sludge tank 8, an exit side chamber 11A is formed integrally with the filtrate chamber 11. A filtrate discharge pipe 12 is provided in the exit side chamber 11A. A filtrate introducing port 14 communicating with the sludge tank 8 is formed on each sidewall facing each other of the filtrate chamber 11. Supply of sludge into the sludge tank 8 and discharge of filtrate therefrom are adjusted so that the liquid level of sludge in the sludge tank 8 is always above that in the filtrate chamber 11. This is to filter sludge in the sludge tank 8 through natural flow from the filtrate introducing port 14 via a filtering means described later into the filtrate chamber 11.
  • Pressure in the filtration can be adjusted by adjusting the difference between the sludge level in the sludge tank 8 and the liquid level in the filtrate chamber 11.
  • a weir 13 for keeping a constant liquid level in the filtrate chamber 11 is provided at the boundary with the exit side chamber 11A of the filtrate chamber 11.
  • a plurality of filtrate chambers 11 may be formed in the sludge tank 8.
  • at least one filtrate introducing port 14 is formed in each filtrate chamber 11.
  • the filtrate chamber 11 may be provided completely within the sludge tank 8.
  • a riser tube 12A formed by extending the filtrate discharge pipe 12 into the filtrate chamber 11 and arranging it vertically, and having a telescopic valve at the leading end thereof can be adopted, as shown in Fig. 4, as means for always keeping a constant liquid level in the filtrate chamber 11.
  • Reference numeral 15 represents filtering means having the lower part immersed in the sludge tank 8.
  • the filtering means 15 is for filtering sludge fed into the sludge tank, and has a filter cloth 18 forming an endless belt which turns endlessly in the vertical direction under the effect of driving means 27 between a lower roller 16 and an upper roller 17 while covering the filtrate introducing port 14.
  • the filter cloth 18 is made of polyester, polypropylene or the like, and turns in a direction and continuously while covering the filtrate introducing port 14.
  • Reference numeral 23 represents a sludge distributing tank having a shape enlarged upward in the tapered form as sludge introducing means. It is provided on a sidewall of the sludge tank 8 on the filter cloth descending side, and has a sludge feeding pipe 9. An inlet side weir 28 is provided at a sludge discharge flow port of the sludge distributing tank 23. As a result, sludge fed from the sludge feeding pipe 9 is uniformly supplied in the width direction of the filter cloth 18 in the sludge tank 8.
  • Reference numeral 24 represents solid stripping means for removing solid materials adhering to the filter cloth 18.
  • the solid stripping means 24 is installed above the sludge level in the sludge tank 8, and gradually strips off the solid materials adhering to the ascending filter cloth 18.
  • stripping means based on scraper having a structure of scraping solid sludge cakes adhering to the filter cloth 18 by means of a scraper is the most desirable.
  • stripping means based on air i.e., stripping means of removing sludge cakes adhering to the filter cloth 18 by ejecting air toward the filter cloth 18, stripping means based on vibration, i.e., stripping means of stripping sludge cakes adhering to the filter cloth 18 by causing the filter cloth 18 to vibrate mechanically or by ultrasonic waves. Stripped solid materials fall into the sludge tank 8, and recovered from the concentrated sludge discharge pipe 10 via the above-mentioned exit side weir.
  • Reference numeral 19 represents nozzle-type cleaning means for cleaning the filter cloth 18.
  • the cleaning means 19 is installed above the solid stripping means 24 on the sludge surface on the filter cloth ascending side in the sludge tank 8, and further removes solid materials which could not be stripped off by the solid stripping means 24.
  • the cleaning means 19 should preferably be cleaning means based on water, i.e., the cleaning means of removing sludge cakes adhering to the filter cloth by ejecting water toward the filter cloth 18. Discharge water in the cleaning produced by the cleaning means 19 is recovered by cleaning discharge water recovering means 26.
  • the cleaning discharge water recovering means 26 is composed of a box-shaped receiving tank having an opening upper ceiling board, and collects cleaning discharge water by installing the cleaning means 19 in this receiving tank or on the upper part of the receiving tank. The thus collected cleaning discharge water is returned to the sludge tank 8 on the filter cloth descending side for filtration again.
  • Reference numeral 25 represents a concentrated sludge discharge tank serving as concentrated sludge discharge means, and has a concentrated sludge discharge pipe 10.
  • the concentrated sludge discharge tank 25 has an exit side weir 31 for recovering concentrated sludge which is concentrated in the sludge tank 8.
  • concentrated sludge can be collected uniformly in the width direction of the filter cloth 18 through natural flowing.
  • the exit side weir 31 By causing the exit side weir 31 to project toward inside of the sludge tank 8, the solids stripped off by the solid stripping means 24 fall onto the exit side weir 31, and are collected together with concentrated sludge.
  • Reference numeral 21 represents filter cloth tensioning means comprising a pair of stretching rollers 20, which give an appropriate tension to the filter cloth 18. Since the filter cloth 18 may be elongated through continuous running for a long period of time, an appropriate tension is constantly imparted to the filter cloth 18 by filter cloth tensioning means 21. Means using an air cylinder is the most desirable as filter cloth tensioning means 21. This type permits constant tensioning of the filter cloth 18 with a uniform force, and installation of tension detector means enables to take an emergency stop action upon breakage of the filter cloth 18.
  • the meandering prevention means should preferably be a nip pressure type meandering correcting apparatus commonly used for automatic coiling of fibers or paper. This apparatus corrects the position of the filter cloth 18 always at the center by arranging a pair of nip-pressure type meandering correctors on each side of the filter cloth 18 so that each of the right and left nips pulls the filter cloth 18 toward the end, and when meandering of the filter cloth 18 occurs by some cause or other and the cloth leans to the right or the left, reducing the nip pressure on the leaning side.
  • Reference numeral 22 represents sealing means for sealing the filtrate introducing port 14. While the filtrate introducing port 14 is usually covered with the filter cloth 18, sludge may mix directly into the filtrate chamber 11 without passing through the filter cloth at the width direction end of the filter cloth 18. This is prevented by use of the sealing means 22. When using the sealing means 22, it is desirable to press it against the boundary between the width-direction end of the filter cloth 18 and the filtrate introducing port 14 so that running of the filter cloth is not prevented by the resin plate.
  • Reference numeral 29 represents organic macromolecular coagulant adding means for adding an organic macromolecular coagulant to sludge.
  • organic macromolecular coagulant adding means for adding an organic macromolecular coagulant to sludge.
  • Reference numeral 30 represents inorganic coagulant adding means necessary when adding an inorganic coagulant to sludge.
  • inorganic coagulant adding means necessary when adding an inorganic coagulant to sludge.
  • the most desirable method is to first add the inorganic coagulant to the sludge to be disposed of, and then add the organic macromolecular coagulant. It is also possible to apply a method of adding simultaneously the inorganic coagulant and the organic macromolecular coagulant considering the piping of the plant, or a method of first adding the organic macromolecular coagulant, and then adding the inorganic coagulant.
  • the coagulant added to the sludge to be disposed of should preferably comprise exclusively an organic macromolecular coagulant.
  • organic macromolecular coagulants added by the organic macromolecular coagulant adding means 29 include a cationic coagulant, a nonionic coagulant, and an anionic coagulant.
  • a cationic coagulant is particularly preferable.
  • the sludge to be disposed of exclusively comprises an excess sludge, or when sufficient filtering and concentration cannot be accomplished with an organic macromolecular coagulant alone, an organic macromolecular coagulant and an inorganic coagulant are used simultaneously.
  • the inorganic coagulant to be added to sludge should preferably be a coagulant mainly comprising iron or aluminum, and poly ferric sulfate is particularly preferable because of the possibility to use against bad odor and to use for removal of phosphorous
  • the ratio of addition of the inorganic coagulant, varying with properties of sludge, should preferably be within a range from 5 to 30 % relative to the solid content in sludge, or particularly preferably, within a range from 5 to 15 %.
  • the ratio of addition of the organic macromolecular coagulant, varying with properties of sludge, should preferably be within a range from 0.01 to 0.2 % relative to the solid content in sludge when simultaneously using with an inorganic coagulant, or particularly preferably, within a range from 0.05 to 0.1 %.
  • the preferable range is from 0.1 to 0.3 % relative to the solid content in sludge, or a particularly preferable range is from 0.1 to 0.2 %.
  • the thus concentrated sludge passes through the exit side weir 31 provided in the sludge tank 8 on the filter cloth ascending size, and is discharged outside the sludge tank 8 from the concentrated sludge discharge pipe 10.
  • the filtrate flowing into the filtrate chamber 11 is discharged, through the weir 13 in the case of the sludge concentrating apparatus shown in Fig. 1, and through the riser tube 12A in the case of the sludge concentrating apparatus shown in Fig. 4, from the filtrate discharge pipe 12 to outside the filtrate chamber 11, and collected.
  • the filtrate level in the filtrate chamber 11 is kept constant by the weir 13 or the riser tube 12A.
  • sludge cakes adhere to the filter cloth 18 and accumulate there. These sludge cakes are gradually stripped off by the solid stripping means 24, discharged from the exit side weir 31 to outside the sludge tank 8, and collected together with concentrated sludge. While most of the adhering sludge cakes are stripped off by the solid stripping means 24, sludge cakes not stripped off are gradually removed by the cleaning means 19 and regenerated. The filtering efficiency of the filter cloth 18 is therefore never reduced, and the filtering means 15 is constantly operated stably.
  • cleaning discharge water produced by the cleaning means 19 is collected by the cleaning discharge water collecting means 26, the concentrated sludge is never diluted on the filter cloth ascending side as a result of mixture of cleaning discharge water into the sludge tank 8 on the filter cloth ascending side.
  • Cleaning discharge water collected by the cleaning discharge water collecting means 26 is returned to the sludge tank on the filter cloth ascending side and filtered again.
  • filtrate When disposing of mixed sludge by adding a coagulant thereto, filtrate has a higher clarity than when disposing thereof without adding a coagulant.
  • the filtrate in the filtrate chamber 11 can be used as cleaning water. By thus using the filtrate in the filtrate chamber 11, it is possible to prevent the consumption of disposal water from increasing.
  • filter cloth tensioning means 21 and filter cloth meandering preventing means eliminates the risk of racing or meandering of the filter cloth 18 even upon occurrence of elongation of the filter cloth 18. This permits achievement of continuous running of the filter cloth 18, thus ensuring safe operation for a long period of time. Even upon breakage of the filter cloth, the apparatus can be emergency-stopped, thus providing remarkable merits in practice.
  • an acid may be added in addition to the coagulant added to the sludge.
  • the acid should preferably be sulfuric acid or hydrochloric acid.
  • the coagulant used is based on sulfuric acid, however, it is desirable to use sulfuric acid, and to use hydrochloric acid in the case of a hydrochloric acid based coagulant.
  • the combination of poly ferric sulfate and sulfuric acid is particularly preferable.
  • the feed amount of the acid is adjusted by measuring pH of supernatant water, separated water or filtrate from the above-mentioned sludge concentrating apparatus so that pH has a certain value (from 4 to 6). Since this ensures a constant feed amount of the inorganic coagulant, it is possible to reduce the feed amount of the inorganic coagulant, and to conduct stable solid/liquid separation and concentration.
  • the method for adding the coagulant and the acid to sludge comprises, as shown in Fig. 5, the steps of providing an inorganic coagulant storage tank 32 and an acid storage tank 33, sending the acid in the acid storage tank 33 into a pipeline 36 or a pipeline 37 having a feeding pump 38 by means of a feeding pump 35, mixing the sludge and the inorganic coagulant, and feeding the resultant mixture to the sludge concentrator.
  • the point where the acid is fed to the pipeline 36 via the pipeline 34 may be before or after the supply of the inorganic coagulant to the pipeline 36 from the pipeline 37. Preferably, it should be before supply of the inorganic coagulant, as shown in Fig. 5.
  • a mixed sludge comprising a mixture of sludge in a primary settling tank and an excess sludge of a sewage disposal plant (solid content in excess sludge: 50 %) was concentrated.
  • the mixed sludge had an SS concentration of 0.5 % (in average).
  • a cationic coagulant was added as an organic macromolecular coagulant in a fixed amount of 0.1 % relative to the solid concentration.
  • concentration was carried out by adding an inorganic coagulant (poly ferric sulfate only) in a fixed amount of 15 % relative to the solid concentration. The result is shown in Table 1.
  • An excess sludge of a sewage disposal plant was concentrated.
  • the excess sludge had an SS concentration of 0.8 % (in average).
  • poly ferric sulfate was added in a fixed amount of 15 % relative to the solid content.
  • organic macromolecular coagulant a cationic coagulant was added in a fixed amount of 0.05 % relative to the solid content.
  • concentration was conducted by adding only an inorganic coagulant (poly ferric sulfate) in an amount of 15 % relative to the solid content. The result is shown in Table 2.
  • a mixed sludge comprising a mixture of sludge in a primary settling tank and an excess sludge of a sewage disposal plant was concentrated by the gravity concentrating method.
  • the mixed sludge had an SS concentration of 0.9 % (in average), and a PO 4 -P concentration of 36 mg/l.
  • Sulfuric acid was added as an acid so that supernatant water had a pH of 6.
  • Poly ferric sulfate was added as a coagulant in a fixed amount of 15 % relative to the solid content.
  • sludge was concentrated by adding only a coagulant (poly ferric sulfate) in a fixed amount of 20 % relative to the solid content without adding an acid or another coagulant.
  • Separated liquid concentration PO 4 -P concentration of separated liquid Solids Concentration of Concentrated sludge Acid or coagulant not added (Comparative Example) 2160 mg/l 34 mg/l 1.8 % Acid not added and coagulant added 1100 mg/l 5 mg/l 3.1% (Comparative Example) Acid and coagulant added (Example of Invention) 190 mg/l 3 mg/l 4.4 %
  • a mixed sludge resulting from mixture of sludge in a primary settling tank and an excess sludge of a sewage disposal plant was concentrated by using the above-mentioned filter cloth filtering concentrator.
  • the mixed sludge had an SS concentration of 0.3 % (in average) and a PO 4 -P concentration of 41 mg/l.
  • Sulfuric acid was added as an acid so that the filtrate had a pH of 5.5.
  • Poly ferric sulfate was added as a coagulant in a fixed amount of 15 % relative to the solid content.
  • a Comparative Example only a coagulant (poly ferric sulfate) was added in a fixed amount of 20 % relative to the solid content.
  • Example of the present invention in which an acid and a coagulant were added, the SS concentration of separated liquid was lower, with a better concentration efficiency, and PO 4 -P could sufficiently be removed as compared with the case with no addition of an acid or a coagulant, and the case with addition of only a coagulant.
  • Fig. 6 is a perspective view, as viewed from the filter cloth descending side, illustrating still another sludge concentrating apparatus of the present invention, wherein sludge uniform feeding means is provided;
  • Fig. 7 is a sectional view illustrating further another sludge concentrating apparatus of the present invention, wherein sludge uniform feeding means is provided;
  • Fig. 8 is a perspective view, as viewed from the filter cloth descending side, illustrating another sludge concentrating apparatus of the present invention, wherein a filtrate chamber is provided in the sludge tank;
  • Fig. 6 is a perspective view, as viewed from the filter cloth descending side, illustrating still another sludge concentrating apparatus of the present invention, wherein sludge uniform feeding means is provided;
  • Fig. 7 is a sectional view illustrating further another sludge concentrating apparatus of the present invention, wherein sludge uniform feeding means is provided;
  • Fig. 8 is a perspective view, as viewed from the filter cloth
  • FIG. 9 is a perspective view, as viewed from the filter cloth ascending side, illustrating another sludge concentrating apparatus of the present invention, wherein a sludge uniform discharge means is provided;
  • Fig. 10 is a sectional view illustrating another sludge concentrating apparatus of the present invention, wherein sludge uniform discharge means is provided;
  • Fig. 11 is a sectional view illustrating a sludge concentrating apparatus of the present invention having cleaning spray nozzles arranged in a staggered form;
  • Fig. 12 is a plan view illustrating cleaning means having cleaning spray nozzles arranged in a staggered form;
  • Fig. 13 is a perspective view illustrating cleaning means having cleaning spray nozzles arranged in a staggered form;
  • Fig. 14 is a plan view illustrating cleaning means having oscillatory cleaning spray nozzles; and
  • Fig. 15 is a perspective view illustrating cleaning means having oscillatory cleaning spray nozzles.
  • reference numeral 8 represents a sludge tank; 9, a sludge feed pipe; 10, a concentrated sludge discharge pipe; 11, a filtrate chamber; 11A, an exit side chamber; 12, a filtrate discharge pipe; 12A, a riser tube; 13, a weir; 14, a filtrate introducing port; 15, a filtering means; 16, a lower roller; 17, an upper roller; 18, a filter cloth; 19, a cleaning means; 20, a tensioning roller; 21, filter cloth tensioning means; 22, sealing means; 23, a sludge distributing tank; 24, solid stripping means; 25, a concentrated sludge discharge tank; 26, cleaning discharge water collecting means; 27, driving means; and 28, an inlet side weir, respectively.
  • the sludge concentrating apparatus of the present invention shown in Figs. 6 to 11 is characterized in that sludge uniform feeding means is provided in the sludge distributing tank 23.
  • the sludge uniform feeding means comprises a combination of a flow adjustment device 39 with the inlet side weir 28 provided at the sludge flow exit of the sludge distributing tank 23, but the flow adjustment device 39 alone is applicable.
  • the inlet side weir 28 is a submerged weir so as to maintain the cohesive state of sludge.
  • the flow adjustment device 39 is formed into a cylindrical shape so as to ensure smooth supply of sludge.
  • the sludge fed from the sludge feed pipe 9 by the sludge uniform feeding means is supplied uniformly in the width direction of the filter cloth 18 in the sludge tank 8.
  • the cleaning means 19 must have a structure capable of permitting cleaning of the surface and back of the filter cloth 18 and preventing uneven cleaning.
  • the cleaning means 19 having such a structure for example as shown in Figs.
  • an inside header pipe 19B having a plurality of inside spray nozzles 19A attached thereto at certain intervals is horizontally (in the filter cloth width direction) arranged in the inside of the filter cloth 18, and two outside header pipes 19D, each having a plurality of outside spray nozzles 19C attached at certain intervals are horizontally (in the filter cloth width direction) arranged to the outside of the filter cloth 18, and outside spray nozzles 19C of the neighboring outside header pipe 19D are arranged alternately in a staggered form.
  • a plurality of inside header pipes 19B may be arranged with inside spray nozzles 19A arranged in a staggered form.
  • a plurality of header pipes may be arranged in and outside, with inside and outside spray nozzles arranged in a staggered form. Further, a plurality of spray nozzles 19A may be arranged in a staggered form on a single header pipe 19B.
  • the outside header pipe 19D may be oscillated horizontally (in a filter cloth width direction).
  • the inside header pipe 19B may be oscillated, or both the inside and outside header pipes 19B and 19D may be oscillated.
  • the sludge uniform discharge means is provided in the concentrated sludge discharge tank 25.
  • the sludge uniform discharge means comprises a roller 40 and a scraper 41 serving as deposit stripping means which strips off deposit adhering to the roller 40.
  • the sludge uniform discharge means forcedly discharge deposit simultaneously with the concentrated waste liquid so that deposit mixed in the concentrated waste liquid discharged from the exit side weir 31 is prevented from adhering to the exit side weir 31 and from being an obstacle to discharge of the concentrated waste liquid.
  • the roller 40 of the sludge uniform discharge means is therefore installed horizontally in parallel with the exit side weir 31.
  • the roller.40 is rotated by driving means 42 or in conjunction with driving means 27.
  • the distance between the inner wall surface of the sludge tank 8 at the concentrated sludge discharge side and the outer surface of the filter cloth 18 is smaller than the distance between the inner wall surface of the sludge tank 8 at the sludge feeding side and the filter cloth 18 outer surface. More specifically, the former is 1/3 to 1/5 the latter. This permits stable discharge even when disposing of a high concentration sludge.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Filtration Of Liquid (AREA)

Abstract

La présente invention concerne un dispositif de concentration de boues comprenant un réservoir de stockage de boues, un moyen de filtrage présentant une toile filtrante à bande sans fin tournant autour de rouleaux supérieurs et inférieurs, le rouleau le plus bas étant immergé dans la boue, un moyen de lavage de toile filtrante, une chambre à filtrat présentant une admission de filtrat proche de la toile filtrante et un déversoir, un réservoir de distribution de boues servant de moyen d'introduction de boues dans le réservoir de boues et étant disposé près de l'extrémité supérieure de l'admission de filtrat, et un réservoir de décharge de boues concentrées servant de moyen de décharge de boues concentrées du réservoir de boues et disposé dans une position sensiblement opposée au moyen d'introduction de boues, la toile filtrante étant intercalée entre les deux. Ledit dispositif comprend également un moyen d'addition de floculant permettant d'ajouter un floculant à la boue alimentée dans le réservoir de boues, un moyen d'addition d'acide permettant d'ajouter un acide, et un rectificateur servant de moyen d'alimentation uniforme de boues permettant d'alimenter la boue dans le réservoir de boues uniformément sur la largeur de la toile filtrante. Ainsi, la boue produite dans une installation de décharge des eaux d'égout peut être concentrée en grandes quantités et de manière efficace sans dépendre de ses propriétés.

Claims (10)

  1. Appareil de concentration de boue comprenant :
    un réservoir de boue (8) pour stocker la boue ;
    des moyens de filtration (15) comprenant un tissu filtrant (18) ayant une forme d'une courroie sans fin qui tourne entre pluralité de rouleaux (16, 17), au moins le rouleau le plus bas desdits rouleaux (16, 17) étant positionné pour être immergé dans la boue ;
    une chambre de filtrat (11) comprenant un orifice d'introduction de filtrat (14) à travers lequel le filtrat provenant desdits moyens de filtration (15) peut s'écouler dans la chambre de filtrat (11), ledit tissu filtrant (18) étant maintenu en contact étroit avec ledit orifice d'introduction de filtrat (14) ;
    des moyens de lavage (19) pour laver ledit tissu filtrant (18) ;
    des moyens d'introduction de boue (23) pour introduire de la boue dans ledit réservoir de boue (8), lesdits moyens d'introduction de boue (23) étant prévus à proximité d'une extrémité supérieure dudit orifice d'introduction de filtrat (14) ; et
    des moyens de décharge de boue concentrée (25) à travers lesquels la boue est déchargée dudit réservoir de boue (8), lesdits moyens de décharge de boue (25) étant prévus à une position sensiblement opposée auxdits moyens d'introduction de boue (23) avec ledit tissu filtrant (18) entre eux ;
    caractérisé en ce que ledit appareil de filtration de boue comprend en outre des moyens pour maintenir un niveau de liquide dans ladite chambre de filtrat (11) sensiblement constant ;
    lesdits moyens pour maintenir un niveau de liquide dans ladite chambre de filtrat (11) sensiblement constant comprennent :
    a) un trop-plein (13) prévu au niveau d'une limite entre ladite chambre de filtrat (11) et une chambre de sortie (11A) dans laquelle le filtrat provenant de ladite chambre de filtrat (11) s'écoule avant d'être déchargé ; ou
    b) un tube de dégagement (12A) qui s'étend verticalement dans ladite chambre de filtrat (11) et communique avec un tuyau de décharge (12) à travers lequel le filtrat est déchargé de ladite chambre de filtrat (11).
  2. Appareil de concentration de boue selon la revendication 1, comprenant en outre des moyens d'ajout de coagulant (29) pour ajouter un coagulant à la boue alimentée dans ledit réservoir de boue (8), et des moyens d'ajout d'acide pour ajouter un acide à la boue alimentée dans ledit réservoir de boue (8).
  3. Dispositif de concentration de boue selon la revendication 2, dans lequel l'acide est de l'acide sulfurique, et le coagulant non organique est du polysulfate ferrique.
  4. Dispositif de concentration de boue selon l'une quelconque des revendications 1 à 3, dans lequel lesdits moyens d'introduction de boue (23) comprennent des moyens d'alimentation uniforme de boue (28) qui amènent la boue à être alimentée uniformément dans ledit réservoir de boue (8) dans une direction de largeur dudit tissu filtrant (18).
  5. Dispositif de concentration de boue selon la revendication 4, dans lequel lesdits moyens d'alimentation uniforme de boue comprennent au moins l'un parmi un trop-plein immergé (28) et un dispositif de réglage d'écoulement (39).
  6. Dispositif de concentration de boue selon l'une quelconque des revendications 1 à 5, dans lequel une distance située entre une surface de paroi interne dudit réservoir de boue (8) au niveau d'un côté de décharge de boue concentrée et une surface externe dudit tissu filtrant (18) est inférieure à une distance située entre une surface de paroi interne dudit réservoir de boue (8) au niveau d'un côté d'alimentation de boue et une surface externe dudit tissu filtrant (18).
  7. Dispositif de concentration de boue selon l'une quelconque des revendications 1 à 6, comprenant en outre des moyens de décharge uniforme de boue (40) pour décharger uniformément la boue dudit réservoir de boue (8) dans la direction de largeur dudit réservoir de boue (8).
  8. Dispositif de concentration de boue selon la revendication 7, dans lequel lesdits moyens de décharge uniforme de boue sont prévus en aval d'un trop-plein de sortie (31) desdits moyens de décharge de boue concentrée (25) et comprennent un rouleau (40) et un élément de vidage de dépôt (41).
  9. Dispositif de concentration de boue selon l'une quelconque des revendications 1 à 8, dans lequel lesdits moyens de lavage (19) comprennent une pluralité de buses de pulvérisation de nettoyage (19A, 19C) agencées selon une forme en quinconce et alimentées par un ou plusieurs tuyaux collecteurs (19B, 19D).
  10. Dispositif de concentration de boue selon l'une quelconque des revendications 1 à 9, dans lequel lesdits moyens de lavage (19) sont adaptés pour osciller
EP02769595A 2001-05-14 2002-05-14 Dispositif de concentration de boues Expired - Lifetime EP1403223B1 (fr)

Applications Claiming Priority (17)

Application Number Priority Date Filing Date Title
JP2001143915 2001-05-14
JP2001143912 2001-05-14
JP2001143913 2001-05-14
JP2001143914 2001-05-14
JP2001143916 2001-05-14
JP2001143912 2001-05-14
JP2001143916 2001-05-14
JP2001143915 2001-05-14
JP2001143911 2001-05-14
JP2001143913 2001-05-14
JP2001143911 2001-05-14
JP2001143914 2001-05-14
JP2002020649 2002-01-29
JP2002020650 2002-01-29
JP2002020650A JP2003033800A (ja) 2001-05-14 2002-01-29 汚泥濃縮方法および装置
JP2002020649 2002-01-29
PCT/JP2002/004654 WO2002092520A1 (fr) 2001-05-14 2002-05-14 Procede et dispositif de concentration de boues

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EP1403223A1 EP1403223A1 (fr) 2004-03-31
EP1403223A4 EP1403223A4 (fr) 2004-12-01
EP1403223B1 true EP1403223B1 (fr) 2006-12-06

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EP (1) EP1403223B1 (fr)
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CN103420552A (zh) * 2013-08-29 2013-12-04 海盐海利废塑回收处理有限公司 一种含油污泥的处理方法
CN104258620B (zh) * 2014-09-20 2016-02-10 扬州海笑环保科技有限公司 吞吐式固液体分离机
CN105032009A (zh) * 2015-08-27 2015-11-11 川源(中国)机械有限公司 一种滤布张紧度调节装置及带式污泥脱水机
CN105854384A (zh) * 2016-05-18 2016-08-17 江苏佳华新材料科技有限公司 一种化工场所污水池除污装置
CN106809988A (zh) * 2017-01-03 2017-06-09 沈阳建筑大学 一种低温滤布滤池过滤水微絮凝体快速形成控制方法
CN107253817A (zh) * 2017-08-15 2017-10-17 安尼康（福建）环保设备有限公司 一种实现均匀分流的方形絮凝合槽
CN112110530A (zh) * 2020-10-09 2020-12-22 马鞍山健鼎化工有限公司 一种污水处理用聚合硫酸铁投料设备及工作方法
CN113440929A (zh) * 2021-08-11 2021-09-28 清远市德晟嘉恒能源环保工程有限责任公司 一种农村污水分级处理装置
CN113952784B (zh) * 2021-11-17 2023-03-24 怀化南岭民用爆破服务有限公司 一种膨化硝铵炸药生产用一体化油相溶液过滤装置

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EP1403223A4 (fr) 2004-12-01
DE60216594D1 (de) 2007-01-18
WO2002092520A1 (fr) 2002-11-21
US20050067355A1 (en) 2005-03-31
DE60216594T2 (de) 2007-09-27
US7029580B2 (en) 2006-04-18
EP1403223A1 (fr) 2004-03-31

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